Re: Limited Shared Buffer Problem

Cédric Villemain wrote:
> AFAIK effective_cache_size is estimation of OS Page Cache + Estimated
> Cache in shared_buffers.
>

Yes, the total value you set is used as is, and should include both
pieces of memory.  The planner doesn't add the shared_buffers value to
the total first for you, as some people might guess it would.

The only thing effective_cache_size is used for is estimating how
expensive an index is likely to be to use, to make decisions like when
to do an index-based scan instead of just scanning the table itself.

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Greg Smith    2ndQuadrant   Baltimore, MD
PostgreSQL Training, Services and Support
greg@2ndQuadrant.com  www.2ndQuadrant.com